diff --git a/reference/image/functions/imagecolortransparent.xml b/reference/image/functions/imagecolortransparent.xml
index c4807e49cf..f1c93ea65c 100644
--- a/reference/image/functions/imagecolortransparent.xml
+++ b/reference/image/functions/imagecolortransparent.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 <!-- splitted from ./en/functions/image.xml, last change in rev 1.36 -->
  <refentry id="function.imagecolortransparent">
   <refnamediv>
@@ -24,7 +24,7 @@
    <note>
     <para>
      The transparent color is a property of the image, transparency is not a
-     property of the color. Once you have a set a color to be the transparent
+     property of the color. Once you have set a color to be the transparent
      color, any regions of the image in that color that were drawn previously
      will be transparent.
     </para>
@@ -33,6 +33,12 @@
     The identifier of the new (or current, if none is specified)
     transparent color is returned.
    </para>
+   <note>
+    <para>
+     Transparency is copied only with <function>imagecopymerged</function> and
+     true color images, not with <function>imagecopy</function> or pallete images.
+    </note>
+   </para>
   </refsect1>
  </refentry>
 
diff --git a/reference/image/functions/imagecopymerge.xml b/reference/image/functions/imagecopymerge.xml
index 4218160d4f..c9bc650fc8 100644
--- a/reference/image/functions/imagecopymerge.xml
+++ b/reference/image/functions/imagecopymerge.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/image.xml, last change in rev 1.36 -->
  <refentry id="function.imagecopymerge">
   <refnamediv>
@@ -31,7 +31,8 @@
     The two images will be merged according to <parameter>pct</parameter>
     which can range from 0 to 100.  When <parameter>pct</parameter> = 0,
     no action is taken, when 100 this function behaves identically
-    to <function>imagecopy</function>.
+    to <function>imagecopy</function> for pallete images, while it
+    implements alpha transparency for true colour images.
    </para>
    <note><para>This function was added in PHP 4.0.6</para></note>
   </refsect1>